Numerical Simulations of Fluid Dynamics with a Pair Interaction Automaton in Two Dimensions

We perform numerical expe riments wit h a novel cellularautomaton fluid mod el. T he mod el has simple pair -in t eraction rules and works in arb it rarily man y dimensions; here we consider the twodimension al case . By observing the smoothing-out of the velocity profile of a shear flow and t he relax ati on of a shea r wave, we measure t he kin em ati c shear viscosity and obtain a value of R; 0.5. To demonstrate t he fluid-like beh avior of our automaton model, we also simulate a flow past an obs tacle (von Karman vortex st reet) .